index.dt 

doctype html
head
    title File upload
body
    form(method='post', action='/upload', enctype='multipart/form-data')
        label(for='file') file
        br
        input(name='file', type='file')
        br
        button(type='submit') Send

upload.dt 

doctype html
head
    title File upload
body
    br 
    -foreach(f; images)
        text(name='title')=f
        br
        img(src=f)
        br

app.d: 

import vibe.vibe;
import std.stdio : writeln;
import std.file : dirEntries, SpanMode;

final class Router
{
   void postUpload(HTTPServerRequest req, HTTPServerResponse res)
   {
     auto file = "file" in req.files;

     try {
     moveFile(file.tempPath, Path("./public/uploads") ~ file.filename);
     writeln("Uploaded successfully!");
     } 

     catch (Exception e) {
     writeln("Exception thrown, trying copy");
     copyFile(file.tempPath, Path("./public/uploads") ~ file.filename);
     }

     auto images = dirEntries("./public/uploads",SpanMode.shallow)
              .map!(f=> f.name).array;

     images.writeln;
     render!("upload.dt", images);
   }
}

void main()
{
   auto router = new URLRouter;
   router.registerWebInterface(new Router);
   router.get("/", staticTemplate!"index.dt");
   router.get("*", serveStaticFiles("./public/"));

   auto settings = new HTTPServerSettings;
   settings.port = 8080;
   settings.bindAddresses = ["::1", "127.0.0.1"];
   listenHTTP(settings, router);

   runEventLoop;
   logInfo("Server Running");
}

When trying to render 

images

The contents are printed via 

f

and 

images.writeln;

But the actual images are broken/404'd in 

img(src=f)

as shown here: upload test

I'm not sure if it's something silly I'm overlooking, or a fundamental concept I just don't know about. The vibed-github didn't seem to have anything in the examples, nor in the docs, unless i missed it.

Also keep in mind this is just a quick and dirty prototype to get things working.
But I'd appreciate any advice/insight for a more "proper" version.

Thanks in advance.